RU2249674C1 - Composition for inhibition of asphalt-resin-paraffin precipitations - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: composition for prevention of asphalt-resin-paraffin precipitations on basis of liquid pyrolysis products, used in amount of 0.03-0.05 of oil mass, has following composition, %: dark oil polymer resin, received by oxidizing polymerization of heavy pyrolysis resin during blowing of air with flow 17-23 hour^-1, temperature 145-155°C in presence of cobalt salts during 2-2.5 hours, 30-35, alkylaromatic hydrocarbons 65-70.

EFFECT: higher efficiency.

3 ex, 3 tbl

Description

The invention is intended to prevent the formation of asphalt-resin-paraffin deposits (paraffin) in oil and can be used in oil and other industries related to the extraction, transportation and storage of oil.

Currently, to prevent the deposition of paraffin, a wide range of complex in composition substances and compositions is used.

The known method, which consists in introducing into the gas condensate the remainder of the vacuum distillation of fuel oil - tar in an amount of 0.01-1.00 wt.%. As a positive point, it is noted that due to the good solubility of tar in gas condensate and petroleum products at 15-25 ° C, it can be introduced directly into the feed stream without preliminary dissolution [A.S. No. 1364699, cl. E 21 B 37/06, 1988].

The disadvantages of the method are the low efficiency of inhibition and technical difficulties when introducing tar into the object to be inhibited, due to its high melting point.

One of the means to prevent paraffin deposits is a composition of tar, aromatic solvent of nefras and VAT residue from the production of technical Lenacil herbicide from the butanol recovery stage, in the following ratio, wt.% [RF Patent 2057778]:

- tar (15-30)

- aromatic solvent nefras (40-70)

- vat residues of the production of Lenacil herbicide (15-30).

The disadvantage is the high concentration of the introduced additives from 0.2 to 0.6%.

The closest in technical essence is the use of a composition obtained from waste from the petrochemical industry. In the composition, the fraction 130-220 ° С is used as the main component, which is formed in the form of distillation upon receipt of petroleum polymer resins by the method of thermopolymerization of liquid pyrolysis products. As additives in various embodiments, either the bottom residue of the distillation of liquid pyrolysis products with a boiling point above 220 ° C, or oxidized bitumen, or used motor oil is used [RF Patent 2092677]. The degree of inhibition of this composition is from 7 to 38%.

The objective of the present invention is to increase the effectiveness of preventing the formation of paraffin deposits during the production, transportation and storage of oil while expanding the raw material base and assortment of inhibitors based on waste and by-products of the processing of various hydrocarbon feedstocks.

The technical result is achieved by the fact that the composition is a 30-35% solution of dark petroleum polymer resin (TNPS) in alkyl aromatic hydrocarbons and is used in an amount of 0.03-0.05% of the inhibited oil.

Dark petroleum polymer resin (TNPS) is obtained by oxidative polymerization of heavy pyrolysis resin (TPN), which is carried out using air oxygen with a flow rate of 17-23 hours ^-1 at a temperature of 145 -155 ° C in the presence of metal salts of the iron subgroup, in particular cobalt resinate (0 , 05% Co), within 2 hours. The obtained petroleum polymer resins have the following characteristics:

- Appearance - solid dark brown or black amorphous substance;

- softening temperature - 64-65 ° C;

- Iodine number - 48-52 g I _2/100 g;

- solubility in toluene is complete;

- elemental composition,%: C (85.98), H (9.03), S (0.012), O (0.61).

As aromatic hydrocarbons, toluene, xylenes and solvent can be used.

The specified technical result is achieved by introducing into the oil a depressant additive, which is a 30-35% solution of TNPS in aromatic hydrocarbons and used in an amount of 0.03-0.05% of inhibited oil.

A quantitative assessment of the process of sedimentation was carried out on the installation, developed on the basis of the well-known method of the "cold rod", under the following test conditions: the temperature of the test oil sample - 30 ° C, the temperature of the metal rod - 12 ° C and the duration of a single experiment - 60 minutes. The inhibitory ability of additives to prevent the formation of oil sludge on the "cold rod" was calculated by the formula:

where S _and - the degree of inhibition,%;

W ₀ is the sediment yield of the original oil, g;

W ₁ - the output of oil sediment with an additive,

Example 1. On the oil of the Archinskoye field, the inhibitory properties of the additive (30 wt.%) Based on TNPS obtained in the presence of cobalt and toluene salts (70 wt.%) Were studied.

The use of an inhibiting additive based on TNPS for oil from the Archinsky field prevents the formation of sediment by 66-68% at a concentration in the oil of 0.03-0.05% (Table 1).

Table 1 The inhibitory ability of additives for oil of the Archinsky field. The concentration of additives in oil,% The amount of paraffin in oil, g / 100 g of oil Inhibitory ability,% 0.00 4,51 0,03 1,52 66.26 0.05 1.41 68.76

Example 2. On the oil of the Urmanskoye field, the inhibitory properties of the additive (35%) based on TNPS obtained in the presence of cobalt salts and a mixture of xylene isomers (65%) were studied.

The use of an inhibiting additive based on TNPS for oil of the Urmanskoye field prevents the formation of sediment by 62-67% at a concentration in the oil of 0.03-0.05% (Table 2).

table 2 The inhibitory ability of additives for oil of the Urmanskoye field. The concentration of additives in oil,% The amount of paraffin in oil, g / 100 g of oil Inhibitory ability,% 0.00 1.91 0,03 0.72 62.51 0.05 0.62 67.41

Example 3. The inhibitory properties of the additive (31%) based on TNPS obtained in the presence of cobalt and solvent salts (69%) were studied on oil from the Yuzhno-Tabaganskoye field.

The use of an inhibiting additive based on TNPS for oil of the Urmanskoye field prevents the formation of sediment by 67-70% at a concentration in the oil of 0.03-0.05% (Table 3).

Table 3 The inhibitory ability of additives for oil of the South Tabagan field. The concentration of additives in oil,% The amount of paraffin in oil, g / 100 g of oil Inhibitory ability,% 0.00 5.91 0,03 1.72 70.89 0.05 1.95 67.0

Thus, the proposed additive is an effective tool to prevent asphalt-resin-paraffin deposits in oils and can be used in the oil and other industries related to the production, transportation and storage of oil. The availability and low cost of the initial liquid pyrolysis products, the simplicity and safety of the use of polymerization initiators (air and metal salts of variable valency), a wide range of individual aromatic hydrocarbons and their technical mixtures, as well as their full mutual compatibility and compatibility with oils determine the availability and low cost of the proposed inhibitory composition .

Claims (1)

Composition for preventing asphalt-resin-paraffin deposits based on liquid pyrolysis products, characterized in that the composition used in an amount of 0.03-0.05% by weight of oil has the following composition,%: Dark petroleum resin, obtained by oxidative polymerization blowing heavy pyrolysis resin air consumption 17-23 h ^-1 , temperature 145-155 ° C in the presence of cobalt salts for 2-2.5 h 30 - 35 Alkylaromatic hydrocarbons 65 - 70